http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47025
--- Comment #5 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-09-06 15:56:26 UTC --- Author: rguenth Date: Tue Sep 6 15:56:20 2011 New Revision: 178601 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=178601 Log: 2011-09-06 Richard Guenther <rguent...@suse.de> PR tree-optimization/47025 * tree-ssa-alias.c (ref_maybe_used_by_call_p_1): BUILT_IN_VA_END uses nothing. (call_may_clobber_ref_p_1): BUILT_IN_VA_END is a barrier like BUILT_IN_FREE. (stmt_kills_ref_p_1): BUILT_IN_VA_END kills what its argument definitely points to. * tree-ssa-structalias.c (find_func_aliases_for_builtin_call): BUILT_IN_VA_START doesn't let its va_list argument escape. * tree-ssa-dce.c (propagate_necessity): BUILT_IN_VA_END does not make any previous stores necessary. Modified: trunk/gcc/ChangeLog trunk/gcc/tree-ssa-alias.c trunk/gcc/tree-ssa-dce.c trunk/gcc/tree-ssa-structalias.c